Scotland, as with other Celtic nations, has many prehistoric remains. Many will be familiar with the ancient Neolithic stone monuments, such as the Callanish Stones, on Lewis (Scottish Gaelic: Leodhas), which are thought to date from 4000 to 2600BC. Now a new illustrated booklet has been published with aim of exploring the archaeology of Scotland's lost timber halls and timber circles. It has been created by Forestry and Land Scotland (Scottish Gaelic: Coilltearachd agus Fearann Alba) and Archaeology Scotland.